Question: A variable star is one whose brightness alternately increases and decreases. For the most visible variable star, Delta Cepheid, the time between periods of maximum

A variable star is one whose brightness alternately increases and decreases. For the most visible variable star, Delta Cepheid, the time between periods of maximum brightness is 5.4 days, the average brightness (or magnitude) of the star is 4.0, and its brightness varies by + 0.35 magnitude. Find a function that models the brightness of Delta Cepheid as a function of time.

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